This is the right time to buy Google's Chromecast (a streaming HDMI dongle), if you haven't bought it for whatever reason. If the 35$ is the thing which is holding you back or which is way too high for you, now you'll get it for essentially 20$ less.
The deal is currently live and up until 2nd January. On buying a new Chromecast you'll receive 20$ Play Store credit which you can used to buy apps, games, movies, TV shows, books and many more things.
And as you bought a new Chromecast, click on the Redeem button, and you'll be credited with 20$. However you can also use the Offers section in the Chromecast app for Android to achieve the same result.